NASA @NASA
Our #DARTMission will crash into a non-hazardous asteroid on purpose on Sept. 26 as the world's 1st planetary defense test. But how will we know it worked? To find out, we visited @LowellObs, one of many observatories globally that will monitor the impact. https://t.co/TJn4hq8QKW https://t.co/vAJlUUU3Ax — PolitiTweet.org